Inflatable mattress



FIG. 1 is a top, front perspective view of the inflatable mattress;

FIG. 2 is a top plan view of the inflatable mattress;

FIG. 3 is a bottom plan view of the inflatable mattress;

FIG. 4 is a left side elevation view of the inflatable mattress;

FIG. 5 is a right side elevation view of the inflatable mattress;

FIG. 6 is a front elevation view of the inflatable mattress; and,

FIG. 7 is a rear elevation view of the inflatable mattress. 

CLAIM The ornamental design for an inflatable mattress, as shown and described. 